Headphone



FIG. 1 is a perspective view of a headphone showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is the other side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

Portions shown in broken lines are for environmental purposes but do constitute a part of the claimed invention. 

CLAIM The ornamental design for a headphone, as shown and described. 